inject (-i)
Injecting a package inserts a 'stub' for that package so that
Portage thinks that it is installed. It is handy if you need,
say, a binary version of XFree86 for esoteric hardware, or you
just like to roll your own packages. You must specify a cate-
gory and particular version of a package for injecting. For
example, emerge inject sys-kernel/gentoo-sources-2.4.19.